question_answer

For a convergent nozzle, what is the correct expression for the critical pressure, if the inlet pressure is \[{{P}_{1}}?\]

A) \[{{p}_{1}}{{\left( \frac{2}{\gamma +1} \right)}^{\gamma /\gamma -1}}\]         

B) \[{{p}_{1}}{{\left( \frac{\gamma +1}{2} \right)}^{\gamma /\gamma -1}}\]

C) \[{{p}_{1}}{{\left( \frac{2}{\gamma +1} \right)}^{\gamma -1/\gamma }}\]         

D) \[{{p}_{1}}{{\left( \frac{\gamma +1}{2} \right)}^{2\gamma /\gamma -1}}\]